[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

New Mexico Triassic Vertebrate Paleontology and Jurassic Fossil Vertebratess (free pdfs)

Ben Creisler

New papers:

Spencer G. Lucas and Andrew B. Heckert (2015)
Triassic Vertebrate Paleontology in New Mexico.
Fossil Vertebrates in New Mexico. New Mexico Museum of Natural History
and Science Bulletin 68: 77-96

The Triassic vertebrate paleontological record of New Mexico includes
important assemblages of tetrapod fossils from both the Middle
Triassic Moenkopi Formation and the Upper Triassic Chinle Group. The
Anton Chico Member of the Moenkopi Formation preserves primarily
temnospondyl amphibian body fossils, but the record of reptiles
comprises both sparse body fossil assemblages and more abundant track
assemblages, mostly of chirotheriid reptiles. A bonebed accumulation
of temnospondyls assigned to Eocyclotosaurus appetolatus is
particularly notable. The Upper Triassic Chinle Group in New Mexico
preserves an array of vertebrate faunal assemblages that represent the
entirety of Chinle “time,” and includes numerous bonebeds of
Revueltian age as well as the best records of Apachean vertebrates in
the American West. These include the characteristic assemblages of the
Revueltian and Apachean land-vertebrate faunachrons.


Spencer G. Lucas and Andrew B. Heckert (2015)
New Mexico’s Record of Jurassic Fossil Vertebrates.
Fossil Vertebrates in New Mexico. New Mexico Museum of Natural History
and Science Bulletin 68: 97-104

New Mexico has a relatively sparse Jurassic record of fossil
vertebrates, much less than is known from either the Triassic or the
Cretaceous strata in the state. The oldest Jurassic vertebrates from
New Mexico are the osteichthyans Hulettia americana, Todiltia schoewei
and Caturus dartoni from the Middle Jurassic (Callovian) Luciano Mesa
Member of the Todilto Formation. The overlying Callovian-Oxfordian?
Summerville Formation has yielded fragmentary sauropod dinosaur bones
and teeth assigned to Camarasaurus, and theropod footprints identified
as Megalosauripus and cf. Therangospodus. Most of New Mexico’s
Jurassic vertebrate fossils are from the Upper Jurassic
(Kimmeridgian-Tithonian?) Brushy Basin Member of the Morrison
Formation and include the turtle Glyptops, the theropod dinosaurs
Allosaurus and Saurophaganax, the ornithischian Stegosaurus and
(mostly) sauropod dinosaurs identified as Apatosaurus, Brachiosaurus
and Diplodocus (= “Seismosaurus”). The sparse record of Jurassic
vertebrate fossils in New Mexico is partly due to the extensive eolian
and evaporitic facies in parts of the Jurassic section, but mostly to
a relative lack of effort to explore the Jurassic strata in New Mexico
for vertebrate fossils.